fJY W. N. BENSOX. 597 



Duiigowan Creek, at a point about six miles south-east of Dun- 

 go wan township, across to the Mulla Creek, east of Moonbi. At 

 the south end of this, the writer found antigoritic serpentine, 

 and various intrusive doleritic rocks. A further nortliern con- 

 tinuation of this beyond the Moonbi granite is, perhaps, to be 

 seen in the serpentine which occurs {fide D. A. Porter) near the 

 liead of Moore Creek, from which a nickelifeious opal was ob- 

 tained (12). 



Further to the south-east, Mr. Siissmilch and the writer(13j 

 have observed the occurrence of serpentine at Mt. George, 

 on the Manning River, and have remarked on the presence 

 of the same rock at Glen Lewis, five miles to the n'orth of 

 this spot, and at Bow Bow near Tinonee, south of the Manning 

 River, twelve miles to the south-east of the last-mentioned oc- 

 currence. This last record, we owe to Mr. Card, who received 

 specimens therefrom. Between this group of intrusions of ser- 

 pentine and Gloucester, to the south-west, there is a great de- 

 velopment of Middle and Upper Devonian and Lower Carboni- 

 ferous rocks, extremely like those in the areas to the north, 

 described in the preceding parts of this series. The strike is 

 generally N .W.-S.E., with a S.W. dip. In the Middle Devonian 

 beds thei-e is an immense development of spilite with pillow- 

 structure, rising to form Kangat Mountain. The geology is 

 further complicated by the presence of an infaulted outlier of 

 Permo-Carboniferous rocks, perhaps analogous to that recorded 

 from the Nundle district(14). What exactly is the relationship 

 of this district to those further to the north, has yet to be dis- 

 covered. It lies rather too far to the east to be in the direct 

 continuation of the main Serpentine-line, unless (as is quite pos- 

 sible) the direction of that line has been bent to the E.iS.E. in 

 the Manning River valley. In the absence of such a deflection, 

 it may be suggested that the George Town serpentine is a con- 

 tinuation of the Mulla-Nowendoc line of intrusions, and that 

 the southerly continuation of the main Serpentine-line is indi- 

 cated by the serpentine and chromite, which occurs near Barring- 

 ton (15). and the serpentine recorded by Mr. Andrews, on the 

 Myall River(8). If this be so, however, the Carboniferous and 



